I mocked this up over my lunch break. (Do I smell a boast? Yes, that’s my boast.)

My goodness, I love Photoshop.

The process started on Saturday night when I drew this picture of Spidey for a kid at the church. I snapped it with a super low-res camera phone:

After opening it in Photoshop, I fiddled with the levels and started filling in spots with color to take out some of the dark splotch on his left foot. After seeing the picture in red-and-blue, I really wanted a background. A Google Images search for “New York Skyline” (no restriction on rights) got me this:

Which I used “posterize” to turn into this:

and then layered the final image on top of. Using the “Stroke” function from the “Layer Style” menu gave Spidey a nice white outline, and the result is what you see above.